回复：请问在美国出生的孩子在没有申请护照的情况下能去加拿大吗?

If departing from US/Canada and arriving to Canada/US without transit via a third country, passport is not a must for a US/Canadian citizen/US-GC holder.
If entering from another country, say Japan or France, even a US citizen needs US passport to enter US, a Canadian citizen needs Canadian passport to enter Canada.